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Composite molecular sieve in ten-element cyclic structure and its synthesis process

A composite molecular sieve and ten-membered ring technology, which is applied in the field of preparation of the above-mentioned composite molecular sieve, can solve the problems of prolonging the process flow, increasing the difficulty of operation, increasing investment costs, etc., and achieves the effects of high yield, low pour point and high viscosity index

Inactive Publication Date: 2006-05-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But both processes have shortcomings. The former cannot effectively play the synergistic effect of the mixed molecular sieve components, and the latter prolongs the process, increases the difficulty of operation, and greatly increases the investment cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 130 grams of 85% orthophosphoric acid were added to the mixture of 80 grams of pseudo-boehmite (loss on ignition 32.5%), 15 grams of hydrogen ZSM-23 molecular sieve and 502 grams of water, stirred for 3 hours, then added 136 grams of di n-Propylamine, and finally 73.9 g of 30% silica sol was added. The molar composition of silicoaluminophosphate colloid is: Al 2 o 3 :P 2 o 5 : SiO 2 :R:H 2 O=1.0:1.0:0.6:2.4:56, the addition amount of ZSM-23 molecular sieve is in the silicoaluminophosphate colloid (Al 2 o 3 +P 2 o 5 +SiO2 2 ) 8% of the total weight. After stirring for 12 hours, it was transferred to a 1000 ml autoclave, and after sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 200° C. in 4 hours, and hydrothermal crystallization was carried out for 48 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neu...

Embodiment 2

[0028] 130 grams of 85% orthophosphoric acid were added to the mixture of 80 grams of pseudo-boehmite (loss on ignition 32.5%) and 502 grams of water, stirred for 3 hours, added 15 grams of potassium type ZSM-22 molecular sieve former powder, stirred for 3 Hour, then add 136 grams of di-n-propylamine, and finally add 73.9 grams of 30% silica sol. The molar composition of silicoaluminophosphate colloid is: Al 2 o 3 :P 2 o 5 : SiO 2 :R:H 2 O=1.0:1.0:0.6:2.4:56, the addition amount of ZSM-22 molecular sieve is in the silicoaluminophosphate colloid (Al 2 o 3 +P 2 o 5 +SiO2 2 ) 8% of the total weight. After stirring for 12 hours, transfer it to a 1000 ml high-pressure reactor. After sealing, adjust the stirring speed to 300 rpm, start to heat up, and raise the temperature to 120°C in 4 hours, hydrothermal crystallization for 12 hours, and then heat up to 200°C in 4 hours. Thermal crystallization for 48 hours. After the crystallization was completed, the autoclave was pl...

Embodiment 3

[0030] 130 grams of 85% orthophosphoric acid were added to the mixture of 80 grams of pseudo-boehmite (loss on ignition 32.5%) and 502 grams of water, stirred for 3 hours, added 15 grams of sodium type ZSM-5 molecular sieve former powder, stirred for 3 Hour, then add 136 grams of di-n-propylamine, and finally add 73.9 grams of 30% silica sol. The molar composition of silicoaluminophosphate colloid is: Al 2 o 3 :P 2 o 5 : SiO 2 :R:H 2 O=1.0:1.0:0.6:2.4:56, the addition amount of ZSM-5 molecular sieve is in the silicoaluminophosphate colloid (Al 2 o 3 +P 2 o 5 +SiO2 2 ) 8% of the total weight. After stirring for 12 hours, transfer it to a 1000 ml high-pressure reactor. After sealing, adjust the stirring speed to 300 rpm, start to heat up, and raise the temperature to 120°C in 4 hours, hydrothermal crystallization for 12 hours, and then heat up to 200°C in 4 hours. Thermal crystallization for 48 hours. After the crystallization, the autoclave was placed in water for r...

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Abstract

The composite molecular sieve in ten-element cyclic structure has ten-element cyclic Si-Al structure and ten-element cyclic aluminum silicon phosphate structure. It is prepared through adding ZSM-22, ZSM-23, ZSM-5, EU-1, NU-87 or other ten-element cyclic structure Si-Al molecular sieve into aluminum silicon phosphate sol obtained via mixing Si source, Al source, P source, water and template agent to obtain primary sol; and subsequent hydrothermal crystallization to obtain the compound molecular sieve. The synthesis conditions may be altered based on the requirement to change the two phase ratio and the Si / Al ratio. Normally, the added amount of ten-element cyclic Si-Al molecular sieve is 0.01-0.6 time the total oxide weight in the aluminum silicon phosphate sol. The composite molecular sieve in ten-element cyclic structure may be used in the isometric dewaxing of lubricant oil and the isometric pour point depression of diesel oil and exhibits excellent catalytic performance.

Description

technical field [0001] The invention relates to a compound molecular sieve with a ten-membered ring structure. [0002] The present invention also relates to the preparation method of the composite molecular sieve. Background technique [0003] Zeolite molecular sieve materials have special shape-selective catalytic properties due to their uniform composition, regular structure, adjustable surface acidity and molecular size pores, and are used as catalytic materials, gas separation and adsorbents, ion exchangers, etc. It has been widely used in the fields of oil and natural gas processing, fine chemicals, environmental protection and nuclear waste treatment. The catalytic function of molecular sieves has also developed from simple acid catalysis to base catalysis, acid-base bifunctional catalysis, oxidation-reduction catalysis and metal catalysis. The basis of molecular sieve catalytic functionalization and application expansion is the development of new molecular sieve ma...

Claims

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Application Information

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IPC IPC(8): C01B39/02B01J29/04C01B39/54
Inventor 王炳春田志坚胡胜徐竹生徐云鹏林励吾
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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